Felji Shop-Vac 90304 9030400 Cartridge Filter Replacement Type U H12 fits Wet & Dry Vacs Brand New - Unused Parts; Top Quality, Manufactured by Felji; Includes one (1) pleated filter cartridge as pictured. Wet or dry cartridge for ShopVac vacuums; For small, dry debris and minimal wet pickup Easy to install and clean; fits most Shop-Vac wet/dry vacuums 5-gallon and up; Easy to wash with soap and water - Allows multiple use of the same filter insuring a longer life of the filter while saving money; Dimensions: Outside Diameter (OD): 8"; Height: 6.5". Thickness: 3/4". Replaces Shop Vac part numbers: 90304, 9030400, 903-04-00, 903-04, 903-50-00, Type U Filter Does NOT include retaining ring; This PP (Pleated Polypropylene) compound filter has the H12 filtration class and retains 99.97% of particles down to 0.3 micron.